Milling-cutter-sharpening device.



C. E. KLINK & (LH. HERZOG. MILLING CUTTER SHARPENING DEVICE.

APPLICATION FILED FEB.13, 1908.

Patented Mar. 30, 1909.

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, w EN N L c. E. KLINK sa o. H. HERZOG. MILLING GUTTER SHARPENINGDEVICE.

APPLICATION FILED FEB.13, 1908.

916,452. Patent-.ed Mar. 3o, 1909.

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CHARLES E. KLINK AND CHARLES H. HERZOG, OF KINGSTON, PENNSYLVANIA.

MILLNGI-CUTTER-SHARPENING DEVICE.

Specification of Letters Patent.

Patented March 30, 1909.

Application led February 13, 1908. Serial No. 415,729.

To all whom it may concern- Be it known that we, CHARLES E. KLINK andCHARLES H. HERZOG, citizens of the United States, residing at Alingstomin thc county of Luzerne and State of Pennsylvania, have invented a newand useful Milling- Cutter-Sharpening Device, of which the ,following isa specification.

The primary object of the present invention is to provide a novel,simple and entirely practicable means for sharpening anguiar millingcutters by grinding the relief surfaces of the teeth thereof, said meansproducing a perfect mill with each tooth of the same length and bevel.

A further object is to provide means of the above character that isreadily applicable to practically any grinding machine.

The one great objection to the use of milling cutters constructed ofhigh speed steel has been the fact that the hardening process leaves aheavy rough scale sullicient to cause the cutter to be inaccurate sothat good resuits cannot be obtained, and consequently the cutter cannotbe used on accurate work. Even carbon steel will change to such an eX-tent that it is ordinarily worthless where high grade work is required.Experience has demonstrated, however, that by means of the presentinvention, a cutter constructed of high speed steel, regardless of howmuch it may be scaled up in the hardening process, can be brought to astage of perfection that will permit its successful use on work of themost accurate character. it is furthermore well known to those skilledin the art that in hardening the cutter, the shape of the same is oftenchanged due to the unequal expansion and contraction of the metal, and

while this change is usually very slight, it is i often enough lto causethe teeth to be of unequal length so that sometimes less than onethirdof the entire number do the work that shouldy be done by all. By meansof the present invention, every tooth of a milling cutter may be groundto the same length so that all will be cut, resulting in a mill that canbe run at a higher rate of speed and with a higher degree of efficiency.Another advantage is that it eliminates the necessity of the accurateand very expensive master tool now ordinarily employed. Furthermore bygrinding the relief faces of the teeth not only is muchtirne saved, butnot nearly as much of the body of the tooth has to be cut away as withthe method now ordinarily employed, g of grinding the front faces of theteeth. The preferred form of construction is illustrated in theaccompanying drawings, but it will be clearly evident by reference tothe appended claims that the invention is by no means limited to theembodiment disclosed.

ln said drawings: Figure 1 is a side elel vation of the cutter holdingmeans, the l shank thereof being broken away, and illusl trating amilling cutter in lace thereon. l Fig. 2 is a front elevation of thesame. Fig. 8 is a rear elevation, with the shank shown in section. Fig.4 is a longitudinal sectional view on the line 4-11 of Fig. 2. Fig. 5 isa cross sectional view on the line 5-5 of Fig. 4. Fig. 6 is a sectionalview on the line 6 6 of Fig. 11. Fig. 7 is a rear elevation of thesupporting member. Fig. 8 is a plan view showing the arrangement of theparts during the grinding operation.

In the embodiment illustrated, a mounting is employed comprising a shankor mandrel 9 which may be of any suitable character and adapted to beengaged with any chuck or head that will hold it stationary. This shankis provided with a head 10 provided with a pcripherally beveled face.Rotatably mounted on the head is a support 11 provided with a taperedsocket 12 to receive said head 1.0. The head is retained in the socketby means of a face plate 13 secured to the rear side of the support byscrews 14 or other fasteners, the pro er fit of said head being obtainedby a waslier 15 located between the head and face plate 13 and adjustedby suitable screws 16 that are threaded through the plate 13 and bearagainst the washer. The rotation of the support 10 upon the head 11 islimited by a pin 17 threaded into one side of said head and projectingthrough a radial slot 18 formed in one 'wall of the support. The lengthof said slot i 18 determines the amount of movement of the head 11, butthis amount of movement may be further limited by means of a stop plate19 located on the periphery of the su port and movable longitudinallyover t e slot. The late 1S) is also provided with a longitudinal) aholding screw 21 threaded into the su port and having on it a washer 22which 1bears against the outer face of the plate and bridges the slot20.

Projecting from the front face of the supslot 2() through which ispassed port ll is a spindle 23, which is disposed eccentrically to theaxis of movement of the support and is preferably in the form of ascrew, threaded as shown at 2e into said support. The outer end of thescrew has a head 25 notched as shown at 26 to receive a tool by means ofwhich it may be turned. Rotatably mounted on this spindle is the cutterholding device, which comprises a hub 27 that lits snugly in the bore ofa milling cutter and is journaled upon said spindle and held againstdetachment by the head 25, the hub having at its inner end an integrallange 28 that is located alongside the end of the support ll and ispreferably of the same diameter. The said i'lange is provided With acircular series of sockets or openings 29 and the support has a slidinglocking bolt 30, the inner end of Which engages in any of the sockets,thus securing the cutter holding device against rotation on the supportandin dihferent positions. The locking bolt 30 extends directly throughthe face plate 13, and has on its outer exposed end a suitable knurledhead 3l. rlhe bolt passes through a socket 32 in the support, andcarries a fixed collar or ilange 33 located in the inner end of saidsocket. A coiled spring 3a, arranged Within the socket around the bolt,has its inner end bearing against the cellar or flange33, and its outerend bearing against the inner side of the face plate. This spring thusurges the bolt into the sockets.

The head 27 of the cutter holding device is adapted to fit vsnugly in amilling cutter, as for instance, 34a, and it is provided with a key-Way35 arranged to aline With the key-Way 36 of said milling cutter. A keyas 37, engaged in the key-Ways, serves to hold the cutter and hubagainst relative rotation, and this key is retained in place by avsuitable nut 33 screwed upon the projecting end of the hub and alsoconstituting means for Vholding the cutter in place. l/Vhere a thincutter is employed, a Washer as 3Q, may be located on the hub in rearthereof.

In practice, the number of sockets 29 in the cutter holding device isequal to the number of teeth of the milling cutter to be operated upon,and in using the tool, the parts are arranged substantially as shown inFig. 8. The shank 9 is engaged in any suitable head, chuck or supportingdevice 40 by means of which it can be held in fixed relation, the toolbeing associated with the face of a suitable grinding Wheel 41. lf, forinstance, an angular cutter of forty-five degrees is to be ground, thelongitudinal axis of the tool is disposed at forty-five degrees to theaxis of rotation of the grinding Wheel. The cutter is placed in nositionas illustrated in Fig. S With one of the teeth in' coaction with theface of the Wheel. he support 1l is then grasped by the hand and rotatedwhereupon the cutter being secured eccentrically to said axis ofrotation, Will be moved so that the relief face will be ground. Afterhaving operated on one of the teeth, the locking bolt 30 is Withdrawn,the cutter iolding device is rotated until the next socket is inalinement with the bolt, and said bolt is engaged therein. The nexttooth is then operated upon. TWhen all of the teeth have been ground onone side, the cutter is merely reversed and the operation repeated onthe other sides of the teeth. The movement of the support andconsequently of the cutter is limited by the pin 17 in the slot 18. Byadjusting the plate 19, sufficient movement is permitted to grind onetooth without letting the next come into engagement with the Wheel.

lt will be noted that in the present embodiment, the milling cutterholder, Which is rotatable on its ovvn axis, is also mounted onrotatable support and is disposed eccentrically to the axis of rotationof said support. lt Will be evident that the desired grinding ell'ect issecured upon the relief surfaces of a cutter placed on the support bythis peculiar mounting and the movement obtained thereby. It will alsobe 'evident that the same effect is obtained,

Whether the eccentric movement is given to the cutter or to the grindingdevice, the only necessity being the relative eccentric rotation betweenthe tWo.

From the foregoing, it is thought that the construction, operation andmany advantages of the herein described invention will be apparent tothose skilled in the art, Without further description, and it will beunderstood that various changes in the size, shape, proportion, andminor details of construction, may be resorted to Without departing fromthe spirit or sacrificing any of the advantages of the invention.

`Having thus fully described our invention, what We claim as new, anddesire to secure by Letters Patent, is

l. ln means for grinding the relief surfaces of milling cutter teeth,the combination with a milling cutter holding device including anelement that fits into the bore of a milling cutter for carrying suchcutter, and means for movably supporting the holding device at an angleto a grinding member and causing it in its movement to have a path thatis curved and eccentric to the axis of rotation of the milling cutter tocarry the side clearance faces of the milling cutter teeth against thegrinding member in a curved path.

2. .ln means for grinding the relief surfaces of milling cutter teeth,the combination with a rotary grinding member, of a milling cutterholding member including' an element that fits into the bore of amilling cutter for carrying said cutter, and means for supporting themembers in angular relation, said means permitting the relativeymovement of the members and causing the side clearance faces of theteeth of a milling cutter mounted on the element to be cut in a curvethat is disposed eccentrically to the axis of rotation of the millingcutter.

3. In mechanism of the character set forth, the combination with arotatable support, of a cutter holding device rotatably mounted on thesupport eccentrically to the axis of rotation of said support, and meansfor securing the holding device against rotation with respect to and indifferent positions on the support.

4. In means for grinding the relief surfaces of milling cutter teeth,the combination With a rotatable milling cutter holder arranged to fitin the bore of a milling cutter and having a key that engages in thekey- Way of such cutter, of a support on which the holder is mounted torotate eccentrically to the axis of a cutter carried by said holder.

5. In mechanism of the character set forth, the combination with asupport, of a cutter holding device rotatably mounted on the support andhaving a key-way with which the key-Way of the cutter is alined, a keythat engages in both keyways and a locking device for securing thecutter holding device against rotation on the support and in differentpositions.

6. In mechanism of the character set forth, the combination with asupport having a limited rotation and also having a spindle, of amilling cutter holding device including a head arranged to fit in thebore of a milling cutter, said head being rotatable on the s indle andhaving a .(iange provided with soc ets, a locking bolt movably mountedon the support and movable into the different sockets for holding thecutter holding device against rotation and in different positions, andmeans for securing a milling cutter against movement on the head.

7. In mechanism of the character set forth, the combination with arotatable support having a spindle extending longitudinally of buteccentrically to its axis of rotation, of a milling cutter holdercomprising a hub journaled on the spindle and adapted to receive amilling cutter, means for securing the cutter on said hub, and means forsecuring the hub against rotation on the support and in differentpositions.

8. In mechanism of the character set forth, the combination with amounting, of a support rotatable on the mounting, means for imiting therotary movement of the support, and means for rotatably mounting arotary milling cutter on the support eccentrically to its axis ofrotation and securing it in different positions on the rotatable supportand against its rotary movement thereon.

9. In mechanism of the character set forth, the combination With a shankhaving a head, of a support rotatably mounted on the head and having aslot, a pin carried by the head and passing through the slot, anadjustable stop movable to different positions across the slot to limitthe movement of the pin therein, said pin being carried by the support,and means for rotatably mounting the rotary cutter on the support andsecuring it in different positions and against its rotary movementthereon.

10. In mechanism of the character set forth, the combination with amounting, ol' a support rotatable on the mounting, means for limitingthe rotary movement of the support on the mounting, means for rotatablymounting a cutter on the support eccentrically to its axis of rotation,and means for securing such cutter in different positions and againstits rotary movement on the support.

11. In mechanism of the character set forth, the combination with ashank arranged to be engaged in a tubular holding chuck and having ahead, of a support having a rotatable mounting on the head and having asocket to receive the same, means for retaining the head in the socket,said support having a slot, a pin engaged in the slot, and carried bythe head, said pin limiting the rotary movement of the support on thehead, an adjustable stop for the pin mounted on the support and movableacross the slot, a spindle proj ectinfr from the support and disposedeccentricalIy to the axis of rotation, a cutter holding hub rotatablymounted on the spindle and havinga key-Way, a cutter retaining nutmounted on the outer' end of the hub, a flange carried by the inner endof the hub and associated with the head, said flange having an annularseries of sockets, and a spring pressed locking bolt mounted on the headand detachably engaging in the socket.

12. In means for grinding the relief surfaces of milling cutter teeth,the combination with relatively rotatable members, one of which ismounted on the other, of a mandrel projecting longitudinally from onemember and adapted to beheld by a chuck or analogous device, a stemprojecting in an opposite direction from the other member, and meanscarried by the stem for engaging in the bore of a milling cutter andsecuring said cutter on the stem.

13. In means for grinding the relief surfacesof milling cutter teeth,the combination with a mounting including a mandrel ada )ted to be heldby an ordinary chuck or ana ogous holder', of means j ournaled on themounting for holding a milling cutter, said means including a devicethat engages in the bore of said milling cutter and is disposedeccentrically to the axis of rotation of the means.

1-1. In means for grinding the relief surfaces of milling cutter teeth,the combination with a mounting, of a support surrounding and rotatableupon the mounting, and means projecting from the support eccentricallyto its axis of rotation for engaging the bore of a milling cutter tosecure said cutter upon the support eccentrically to its axis ofrotation.

15. In means for grinding the relief surfaces of milling cutter teeth,the combination With a mounting, of a support rotatable upon themounting, means for limiting the extent of the rotary movement, a stemprojecting from the su port eccentrically to its axis, a hub rotatab ymounted on the stem and arranged to fit into the bore of a millingcutter, and means for securing the hub against rotation and in differentpositions with relation to the stem.

16. In means for grinding the relief surfaces of milling cutter teeth,the Combination With a rotary grinding member, of a rotary millingcutter holding member including a device that engages in the bore of amilling centric to its own axis of rotation to grind the relief surfacesof the teeth of a milling cutter placed on the holding member on a curvethat is disposed eccentrically to the axis of rotation of said millingcutter.

In testimony, that We claim the foregoing as our own We have heretoaflixed our signatures in the presence of tWo Witnesses.

CHARLES E..KLINK. CHARLES H. HERZOG.

YWitnesses:

Gus WALsER, JOHN M. BAUsoH.

f rotating one of the members on an axis ec-

